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Poster: dead-head_Monte Date: May 10, 2009 10:26am
Forum: GratefulDead Subject: Re: Better Get While The Gettin's Good...

I figured Charlie was busy. Many haven't seen CM lately. So I grabbed the new gd69-04-23 tracks at LL, and took a crack at helping to patch this thing correctly. Then I fell into my own trap. I made a bad patch. I also caused a CD overburn problem for disc one. My ear training is insufficient. I enjoy giving back. This exercise is a good learning experience, and a good review for the rest of us.

I used Samplitude's time stretcher. I deployed it in hopes that it would cause the pitch to shift with it automatically - like analog. I did NOT dial in an extra pitch change. I honestly don't know if the pitch changed with the time stretch correction I made. I am a Newbie using Samplitude. I put up the process module JPG for everyone to see. My sense of pitch and ear training is meager. That's why I've brought this up for discussion. Maybe I should have used a few PMs first.

http://www.archive.org/iathreads/post-view.php?id=245819
"Since we are a music community here, I was thinking maybe several of you have excellent pitch, or even perfect pitch. Samplitude's Pitch Shifting processor increments in half steps, at a resolution of 100ths of a half step. Somebody give us the correct number to shift up, and we're done here."

I don't see how a tape sitting in a box can go out of pitch. I am confident we have a tape speed problem. This is causing a pitch problem, just as I would expect in analog. Both should be corrected, unless there is some extra processing we don't know about.

Is the pitch on these fixes correct? Most importantly, we just want to get it right. I felt I had to fix my mistakes. I'm rooting for CM.

new upgrade torrents for gd69-04-23:
http://bt.etree.org/details.php?id=524972
http://bt.etree.org/details.php?id=524969

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Poster: dead-head_Monte Date: May 11, 2009 10:02am
Forum: GratefulDead Subject: Re: Better Get While The Gettin's Good...

+3.3% tape speed increase synchs new source speed to old source speed
120 BPM + 3.3% = 123.96 BPM = correct speed rate to increase

according to this source, here is the math to do pitch correction vs speed correction vs beats per minute

+5.94% increase in pitch is one half step - we need +3.3% increase in pitch to match up
3.3 / 5.94 = 55.5% of one half step pitch increase = correct pitch rate to increase

Thanks rbbert for explaining the resample function correctly. I really appreciate it. I did NOT resample. My bad. In Samplitude, I just dialed in 123.96 BPM again. I selected resample this time. It automatically set the pitch rate increase correctly to +56% of a half step. Simple.

I am hoping that in some way this will help that box of old tapes. Thanks Charlie and everyone for your patience. Peace.

samplitude-pitch-speed.jpg



This post was modified by dead-head_Monte on 2009-05-11 17:02:04

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Poster: rastamon Date: May 12, 2009 5:33am
Forum: GratefulDead Subject: Re: Better Get While The Gettin's Good...

been holding up on getting this till the smoke clears....is this >
http://bt.etree.org/details.php?id=524972
the final fix?

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Poster: dead-head_Monte Date: May 12, 2009 9:34am
Forum: GratefulDead Subject: Re: Better Get While The Gettin's Good...

hey Rasta...

I screwed up twice out of two tries. First I patched a new source that was playing slow. I didn't correct it because I don't have ear training for this, and was unaware it was slow. Then I corrected it with CM's data, but it was speed corrected only, not pitch corrected - at this point I was simply trying to fix my own mistake - I thought this was necessary. Bad decision? But I learned what one needs to know to correctly analyze, cite, and repair tape sources using speed correction alone, pitch correction alone, or both - resampling. I also have nailed down the math behind this. I apologize to all whom I may have confused. Get the Miller fix. At the time the new source was released, we did NOT know if CM was around. People were asking for this patch.

CM fix at The Archive

CM fix at bt-eTree

This is the greatest music sharing community I've ever seen. I am very proud to be with all of you. The down-side of submitting one's work here (a new fileset, or a fixed fileset) is that you can't take it back - just like an e-mail you've submitted. Hey, if I didn't make mistakes sometimes, I'd hardly ever learn a thing. Sorry if I disappointed. I'm trying to keep busy, trying to learn, and trying to give back. I appreciate all the support and understanding from everyone. I am a better person because of this place.

I do have a much better understanding for just how incredible the work and efforts of CM, Mr Seamons, Mr Tobin, and many of the other master-Masterers are. No excuses for me. This work is substantial. The details are unforgiving. The traps and ease of errors are endless. One mistake, and people will let you know. This is an amazing place. I can't thank all of you enough.